Fix buffer overflow in stats test
Fix buffer overflow in stats test

Change-Id: Ib5f6f50f894c28b8c7b7d646aa2428577dc8bebb
Reviewed-on: http://review.couchbase.org/44507
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

mrkwse/memcached,daverigby/kv_engine,owendCB/memcached,mrkwse/memcached,couchbase/memcached,cloudrain21/memcached-1,couchbase/memcached,daverigby/memcached,daverigby/memcached,daverigby/kv_engine,couchbase/memcached,daverigby/memcached,daverigby/memcached,cloudrain21/memcached-1,couchbase/memcached,daverigby/kv_engine,cloudrain21/memcached-1,owendCB/memcached,cloudrain21/memcached-1,owendCB/memcached,daverigby/kv_engine,owendCB/memcached,mrkwse/memcached,mrkwse/memcached